Alright well I did everything you said to do and as far as I can tell the general idea worked. However... When I take the saved .cr2 of the newly done clothing item into The Tailor 1.6 I get this error:

Tag Unknown in Channel:trackingScaleMult Line:80430

After I click the ‘okay’ button another error comes up saying:

Error Reading the .CR2 File! Load Aborted.

Coincidentally I get the same error when trying to load V3 into The Tailor after saving her with all of her morphs into my library to use her as the base character...

 I should note that it's not the program itself because I can load the regular V3 SAE cr2 fine as long as I don't add the body morphs into her and then save her. I can also load the A3 version of the dress as the clothing cr2 item too without errors.